WO2024111648A1 - アルミニウム炉及び溶解アルミニウムの製造方法 - Google Patents
アルミニウム炉及び溶解アルミニウムの製造方法 Download PDFInfo
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- WO2024111648A1 WO2024111648A1 PCT/JP2023/042061 JP2023042061W WO2024111648A1 WO 2024111648 A1 WO2024111648 A1 WO 2024111648A1 JP 2023042061 W JP2023042061 W JP 2023042061W WO 2024111648 A1 WO2024111648 A1 WO 2024111648A1
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- aluminum
- chamber
- molten aluminum
- holding chamber
- furnace
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
- B22D21/04—Casting aluminium or magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
- F27B3/04—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces
Definitions
- the present invention relates to an aluminum furnace and a method for producing molten aluminum.
- aluminum ingots are generally brought into a furnace, melted to produce molten aluminum, and the molten aluminum is poured into a holding chamber. After the temperature of the molten aluminum is brought to a specified temperature, it is poured into a waiting chamber. The molten aluminum remaining in the waiting chamber is then used as material for the next manufacturing process.
- the molten aluminum changes from liquid to solid. This causes the molten aluminum to adhere to the walls of the holding chamber of the aluminum furnace, resulting in unnecessary loss of the molten aluminum, and also produces aluminum ash and molten residue when the aluminum melts. This ash and residue flow into the holding chamber along with the molten aluminum. This ash and residue become impurities, and if molten aluminum with a high impurity content is used for various processes, the quality of the product will decrease.
- Patent Document 1 discloses a furnace having an inspection port with a door on the side wall of the furnace for inspecting and removing impurities.
- Patent Document 1 the furnace described in Patent Document 1 is unable to adequately remove ash and residues, and the products manufactured using the resulting molten aluminum are of low quality.
- the present invention was made in consideration of the above problems, and aims to provide an aluminum furnace and a method for producing molten aluminum that can produce high-quality molten aluminum.
- the aluminum furnace of the present invention comprises a melting chamber into which an aluminum ingot is introduced and which melts the ingot to produce molten aluminum, a holding chamber connected to the melting chamber for maintaining the temperature of the molten aluminum flowing from the melting chamber at a predetermined temperature, a lid provided on the top surface of the holding chamber for opening and closing the holding chamber, and a burner provided on the lid for heating the molten aluminum in the holding chamber, characterized in that the distance between the ceiling and floor of the holding chamber is 600 mm or less, and the burner is a proximity heating burner.
- a lid is provided on the top surface of the holding chamber, so that the height of the holding chamber itself can be made lower than that of conventional holding chambers, and the distance between the ceiling and floor of the holding chamber can be made 600 mm or less. Therefore, a close-range heating burner can be used as the burner, so that the oxygen concentration in the holding chamber 4 can be maintained higher than usual. This allows an oxide film to be formed satisfactorily on the surface of the molten aluminum in the holding chamber, and this oxide film can reduce the possibility of contamination by ash or residue. As a result, the quality of the molten aluminum obtained is improved, and high-quality molten aluminum can be obtained with a high yield.
- the holding chamber has a control unit that maintains the distance between the lid and the surface of the molten aluminum in the holding chamber in the range of 100 mm to 300 mm.
- the distance from the close-range heating burner becomes appropriate, and an oxide film can be preferably formed.
- a waiting chamber connected to the holding chamber, with a hole at the bottom of the waiting chamber opening into the side of the bottom wall of the waiting chamber, and a heater for heating in the hole.
- a preferred embodiment of the present invention is one in which the heater is an electric heater with a cylindrical outer shape.
- the heater is removable. Removable heaters allow for easy maintenance.
- a separate heater is provided on the side wall of the waiting chamber. If a separate heater is provided on the side wall, it can withstand more weight than if it were provided on the bottom, and the risk of a fire caused by leakage of high-temperature molten metal can be avoided.
- the aluminum furnace of the present invention is characterized by comprising a melting chamber into which an aluminum ingot is introduced and melted to produce molten aluminum, a holding chamber connected to the melting chamber for maintaining the temperature of the molten aluminum flowing from the melting chamber at a predetermined temperature, a waiting chamber connected to the holding chamber, and a hole opening into the side of the bottom wall of the waiting chamber, with a heater for heating in the hole.
- the method for producing molten aluminum of the present invention is a method for producing molten aluminum using any of the aluminum furnaces described above, and is characterized in that the molten aluminum is produced by controlling a burner to heat the molten aluminum in the holding chamber so that the oxygen concentration in the holding chamber is 5% or more and 10% or less.
- the burner Since a close-range heating burner can be used as the burner, it is possible to set the oxygen concentration in the holding chamber to 5% or more and 10% or less. This allows an oxide film to be formed satisfactorily on the surface of the molten aluminum in the holding chamber, and this oxide film reduces the possibility of contamination by ash or residue. As a result, the quality of the molten aluminum is improved, and high-quality molten aluminum can be obtained with a high yield.
- the oxygen concentration is preferably between 6% and 8%. This range allows for the best formation of an oxide film on the surface of the molten aluminum in the holding chamber, and this oxide film can further reduce the possibility of contamination by ash or residue. As a result, the quality of the molten aluminum is further improved, and high-quality molten aluminum can be obtained with a high yield.
- the aluminum furnace and molten aluminum manufacturing method of the present invention make it possible to obtain high-quality molten aluminum.
- FIG. 1 is a schematic perspective view of an aluminum furnace according to a first embodiment.
- FIG. 1 is a schematic plan view of an aluminum furnace according to a first embodiment.
- FIG. 2 is a cross-sectional view of the aluminum furnace according to the first embodiment taken along line A-A.
- FIG. 2 is a cross-sectional view of the aluminum furnace according to the first embodiment taken along line B-B.
- FIG. 2 is a cross-sectional view taken along line C-C of the aluminum furnace according to the first embodiment.
- the aluminum furnace 1 of this embodiment shown in Figures 1 to 4 is composed of a melting chamber 2, a first burner 3, a holding chamber 4, a lid 5, a second burner 6, a tower 7, a sloped floor 8, a flow path 9, a waiting chamber 10, a first connecting passage 11, a second connecting passage 12, a hinge portion 13, an opening 14, and a heater 15.
- the tower 7, the melting chamber 2, the sloped floor 8, the melting chamber 2, the flow path 9, and the waiting chamber 10 are connected in this order to form a passage through which aluminum passes. That is, in the aluminum furnace 1, an aluminum ingot is introduced into the tower 7 and melted in the melting chamber 2, and the molten aluminum passes through the sloped floor 8, the holding chamber 4, and the flow path 9 and is introduced into the waiting chamber 10. The molten aluminum is then taken out from the waiting chamber 10.
- a detailed explanation will be given below.
- Tower 7 is a hollow cylindrical chamber standing vertically. An opening is formed on the top surface of tower 7 for introducing aluminum ingots into tower 7. The lower part of tower 7 communicates with the chamber of melting chamber 2.
- a first burner 3 is provided on the lower side of tower 7, facing the chamber of melting chamber 2, for melting the aluminum ingots in melting chamber 2 to produce molten aluminum. The first burner 3 is installed tilted downward so that it is output toward melting chamber 2 to melt the aluminum ingots.
- the first burner 3 is a gas injector that is ignited inside itself and is output to melt the aluminum ingots in melting chamber 2.
- the preferred temperature for melting aluminum is in the range of 650°C to 850°C.
- the opening at the top of the melting chamber 2 is connected to the opening at the bottom of the tower 7.
- the melting chamber 2 has an opening for cleaning the inside of the melting chamber 2. Any number of openings for cleaning the inside of the melting chamber 2 may be provided, but in this embodiment, openings are provided on two adjacent wall surfaces, and the openings are provided so that they form an angle of 90° with each other.
- the opening at the bottom of the melting chamber 2 is connected to the slope floor 8, through which the molten aluminum flows from the melting chamber 2 and serves as a passage for the molten aluminum to proceed to the next process.
- sloped floor 8 One end of the sloped floor 8 is connected to the bottom of the melting chamber 2. The other end of the sloped floor 8 is connected to an opening provided on the side of the holding chamber 4. Molten aluminum from the melting chamber 2 is introduced to the sloped floor 8.
- the sloped floor 8 In order to move the molten aluminum to the holding chamber 4 without power, the sloped floor 8 is configured to slope from one end to the other end, and the preferred angle of the slope is 15 to 25 degrees with respect to the horizontal plane, and in this embodiment it is 21 degrees.
- the holding chamber 4 is a rectangular chamber in plan view with an open top surface, and has an entrance opening connected to the other end of the slope floor 8 and an exit opening facing the entrance opening, both on its side walls.
- a temperature sensor is provided in the holding chamber 4 to maintain the temperature of the molten aluminum introduced from the entrance opening at a predetermined temperature, and temperature control is performed using the second burner 6, which will be described in detail later.
- the lid 5 is a flat rectangular plate-like member provided on the top of the holding chamber 4.
- the lid 5 is a steel plate structure with heat insulating material applied.
- the lid 5 is configured so that it can be opened and closed freely at the opening on the top surface of the holding chamber. That is, the lid 5 is normally closed to maintain the temperature inside the holding chamber 4, and is opened when the holding chamber 4 is undergoing maintenance.
- a second burner 6 is provided in the center of the lid 5 to heat the molten aluminum inside the holding chamber 4 so that the temperature of the molten aluminum inside the holding chamber 4 is not allowed to fall below a predetermined temperature.
- a hinge 13 is provided on an extension extending from the wall of the holding chamber 4, and this hinge 13 functions as a rotation axis to open and close in the vertical direction.
- this hinge 13 functions as a rotation axis to open and close in the vertical direction.
- the second burner 6 is a proximity heating burner for maintaining the temperature of the molten aluminum. This burner's flame does not go in a straight line but spreads flatly while swirling, so the entire surface of the molten aluminum can be heated uniformly from a close position.
- a proximity heating burner is a flat flame burner that is configured so that the flame spreads flatly while swirling.
- the second burner 6 can adjust the differential pressure with an air butterfly valve.
- an opening for maintenance is provided in the side wall, and a door is provided at the opening, so the side wall is high and the height from the floor to the ceiling of the holding chamber is higher than 600 mm.
- maintenance inside the holding chamber 4 can be performed by opening and closing the lid body 5 provided on the upper surface, so there is no need to provide an opening in the side wall of the holding chamber 4. Therefore, the height from the floor to the ceiling of the holding chamber 4 can be 600 mm or less. In this embodiment, the height from the floor to the ceiling of the holding chamber 4 is about 580 mm.
- the distance between the lid 5 and the surface of the molten aluminum in the holding chamber 4 is controlled by the control unit of the holding chamber 4 to be within the range of 100 mm to 300 mm. In this embodiment, the distance between the lid 5 and the surface of the molten aluminum in the holding chamber 4 is maintained at 280 mm by the control unit of the holding chamber 4.
- the above-mentioned proximity heating burner can be used as the second burner 6.
- the air-fuel ratio of the second burner 6 is greater than 1.0 and less than 1.5, preferably about 1.5, it is possible to keep the oxygen concentration in the holding chamber 4 in the range of 5% to 10%, preferably 6% to 8%.
- an oxide film can be formed well on the surface of the molten aluminum in the holding chamber 4, and this oxide film plays the role of a surface cover for the molten aluminum in the holding chamber 4, and this surface cover reduces the possibility of ash and residue being mixed in, and good quality molten aluminum can be obtained with a high yield.
- the lid 5 has a first communication passage 11 inside that passes through the lid 5.
- the first communication passage 11 has one opening on the underside of the lid and another opening on the side facing the tower 7.
- a second communication passage 12 is provided on the side wall of the melting chamber 2 on the lid 5 side, passing through the side wall.
- the first communication passage 11 and the second communication passage 12 communicate with each other when the lid 5 is closed, and transfer high-temperature gas between the holding chamber 4 and the melting chamber 2.
- the communication passages 11 and 12 are configured to allow high-temperature gas in the melting chamber 2 to flow into the holding chamber 4 when melting aluminum ingots in the melting chamber 2, thereby saving fuel or energy and maintaining the temperature of the molten aluminum in the holding chamber 4 not lower than a predetermined temperature.
- the second burner 6 is operated to flow high-temperature gas from the second burner 6 into the melting chamber 2, which assists in melting the aluminum ingot in the melting chamber 2, thereby saving fuel used for melting the aluminum.
- the lid 5 is provided on the top surface of the holding chamber 4, not on the side, which makes it easier to remove the oxide film formed on the surface of the molten aluminum in the holding chamber 4, and as a result, high-quality molten aluminum in the aluminum bath protected by the oxide film can be obtained with a high yield.
- the oxide film is formed only on the surface, it is possible to prevent the oxide film from adhering to the bottom of the holding chamber 4, and maintenance is also easy.
- a flow path 9 is provided on the wall of the holding chamber 4, which is connected to the chamber and serves as a passageway for passing the molten aluminum held in the holding chamber 4.
- a waiting chamber 10 is provided in this flow path 9. The molten aluminum in the chamber of the waiting chamber 10 is held in the waiting chamber 10 so that it can be removed to be processed into other products.
- the flow path 9, which opens to the top of the waiting chamber 10, is an opening that the user can use to operate the molten aluminum to turn it into other products.
- a heater in the waiting chamber 10. Providing a heater prevents the molten aluminum from cooling while being held in the waiting chamber 10, which would result in a decrease in yield.
- an opening 14 is provided on the side (lower part) of the bottom wall of the waiting chamber 10, into which the heater 15 is installed. The size and shape of the opening 14 are set according to the size of the heater 15 to be inserted.
- the heater 15 is electric, can be supplied with power from a power source (not shown) and can be output, and has a cylindrical shape.
- the opening 14 is a hole-like shape that is long in one direction and is provided so as to be parallel to the bottom surface of the chamber of the waiting chamber 10.
- the heater 15 is located at the bottom of the chamber of the waiting chamber 10.
- at least one opening 14 is provided, and in this embodiment, multiple openings 14 are provided at a distance from each other. The openings 14 may open on any side of the bottom wall surface.
- each heater 15 is fixed in each opening 14 so as to be removable.
- a heat insulating material or the like may be provided under the heater 15 to increase thermal efficiency.
- Example 1 The temperature of the bath in the holding chamber 4 was set to 670°C, the output of the close-in heating burner (flat flame burner (FF-20K, manufactured by Shoei Seisakusho Co., Ltd.)) as the second burner 6 was set to a maximum of 50,000 kcal/hr, and the amount of LPG mixed gas (40% propane, 60% butane, approximately 24,000 Kcal/ m3 ) was set to approximately 2 m3 to hold an aluminum bath using ADC12 as the aluminum alloy.
- the close-in heating burner flat flame burner (FF-20K, manufactured by Shoei Seisakusho Co., Ltd.)
- LPG mixed gas 50% propane, 60% butane, approximately 24,000 Kcal/ m3
- a gas volume meter was used to adjust the gas valve, and the air butterfly valve of the second burner 6 was used to adjust the differential pressure to 0.6 to 0.8, while sampling the atmospheric gas in the holding chamber 4 and measuring the oxygen concentration with an oxygen concentration meter (oxygen concentration meter: GD-70D (manufactured by Riken Keiki, stationary type)).
- the air ratio was set to more than 1.0 but not more than 1.5 so that the oxygen concentration in the holding chamber 4 was 7%.
- Example 1 The conditions were the same as in Example 1, except that the pressure difference was set so that the air ratio was 1.0 and the residual oxygen concentration in the holding chamber was 0%.
- the present invention is not limited to the above-described embodiment.
- the configuration and shape of the aluminum furnace 1 can be changed as appropriate.
- the holding chamber 4 is rectangular, but is not limited to this and may be circular.
- the aluminum furnace 1 is equipped with the second burner 6 and the heater 15, but is not limited to this and may be configured to include only one of them. Even with this configuration, it is possible to obtain high-quality molten aluminum. Also, a separate heater for heating may be provided on the side wall of the waiting chamber 10.
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- Manufacturing & Machinery (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
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Abstract
Description
保持チャンバ4における保持浴湯温度を670℃、第2バーナー6である近接加熱バーナー(フラットフレームバーナ(株式会社正英製作所製, FF-20K))を出力最大値50,000kcal/hr、LPG混合ガス(プロパン40%、ブタン60%、約24.000Kcal/m3)量を約2m3に設定してアルミニウム合金としてADC12を用いたアルミニウム浴湯の保持を行った。この時、ガス量量計を使用してガスバルブで調整を行い、第2バーナー6のエアーバタフライ弁で差圧が0.6~0.8になるように調整しながら、保持チャンバ4内の雰囲気ガスをサンプリングして酸素濃度測定器(酸素濃度計:GD-70D (理研計器製、据置タイプ))により酸素濃度を計測し、空気比を1.0を超え1.5以下になるようにして保持チャンバ4内の酸素濃度が7%となるようにした。
実施例1とは空気比が1.0になるように差圧を設定して保持チャンバ内の残存酸素濃度が0%となるようにした以外は同一の条件とした。
2 溶解チャンバ
3 第1バーナー
4 保持チャンバ
5 蓋
6 第2バーナー
7 タワー
8 スロープフロア
9 流路
10 待機チャンバ
11 第1連通路
12 第2連通路
13 ヒンジ
14 開口部
15 ヒーター
Claims (9)
- アルミニウムインゴットが投入され、当該インゴットが溶解されてアルミニウム溶湯が生成される溶解チャンバと、
前記溶解チャンバに接続され、前記溶解チャンバから流入した前記アルミニウム溶湯の温度を所定の温度に維持するための保持チャンバと、
前記保持チャンバの上面に設けられ、前記保持チャンバを開閉するための蓋と、
前記蓋に設けられ、前記保持チャンバ内のアルミニウム溶湯を加熱するためのバーナーと、を備え、
前記保持チャンバの天井と床との間の距離が600mm以下であり、前記バーナーが近接加熱バーナーであることを特徴とするアルミニウム炉。 - 前記保持チャンバが、前記蓋と前記保持チャンバ内の前記アルミニウム溶湯の表面との距離を100mm~300mmの範囲に保つ制御部を有することを特徴とする請求項1に記載のアルミニウム炉。
- 前記保持チャンバに接続された待機チャンバと、前記待機チャンバの底面壁の側面に開口した孔部とを備え、
当該孔部に加熱用ヒーターを有することを特徴とする請求項1に記載のアルミニウム炉。 - 前記加熱用ヒーターが、その外形が円筒形状の電気ヒーターであることを特徴とする請求項3に記載のアルミニウム炉。
- 前記加熱用ヒーターが取り出し可能であることを特徴とする請求項3記載のアルミニウム炉。
- さらに別の加熱用ヒーターが前記待機チャンバの側壁に設けられていることを特徴とする請求項3記載のアルミニウム炉。
- アルミニウムインゴットが投入され、当該インゴットが溶解されてアルミニウム溶湯が生成される溶解チャンバと、
前記溶解チャンバに接続され、前記溶解チャンバから流入した前記アルミニウム溶湯の温度を所定の温度に維持するための保持チャンバと、
前記保持チャンバに接続された待機チャンバと、
前記待機チャンバの底面壁の側面に開口した孔部とを備え、
当該孔部に加熱用ヒーターを有することを特徴とするアルミニウム炉。 - 請求項1~7のいずれか1項に記載のアルミニウム炉を用いる溶解アルミニウムの製造方法であって、
保持チャンバ内の酸素濃度の割合が5%以上10%以下になるようにバーナーを制御して前記保持チャンバ内のアルミニウム溶湯を加熱して溶解アルミニウムを製造することを特徴とする溶解アルミニウムの製造方法。 - 前記酸素濃度の割合が6%~8%である請求項8記載の溶解アルミニウムの製造方法。
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| Application Number | Priority Date | Filing Date | Title |
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| JP2024560197A JPWO2024111648A1 (ja) | 2022-11-24 | 2023-11-22 |
Applications Claiming Priority (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TH2203003217 | 2022-11-24 | ||
| TH2203003217U TH22876U (th) | 2022-11-24 | เตาพักคอยอะลูมิเนียมที่มีอุปกรณ์ให้ความร้อน | |
| TH2203003215 | 2022-11-24 | ||
| TH2203003215U TH22875U (th) | 2022-11-24 | เตาหลอมอะลูมิเนียมที่มีอุปกรณ์ให้ความร้อน | |
| TH2303001432U TH25484A3 (th) | 2023-05-29 | เตาหลอมอะลูมิเนียมและกรรมวิธีการผลิตอะลูมิเนียมหลอมเหลวที่ใช้เตาหลอมอะลูมิเนียมดังกล่าว | |
| TH2303001433 | 2023-05-29 | ||
| TH2303001433U TH25495A3 (th) | 2023-05-29 | เตาพักคอยอะลูมิเนียมและกรรมวิธีการผลิตอะลูมิเนียมหลอมเหลวที่ใช้เตาพักคอยอะลูมิเนียมดังกล่าว | |
| TH2303001432 | 2023-05-29 |
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| WO2024111648A1 true WO2024111648A1 (ja) | 2024-05-30 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11264029A (ja) * | 1998-03-17 | 1999-09-28 | Nippon Light Metal Co Ltd | アルミニウム精製方法及び精製装置 |
| WO2011111525A1 (ja) * | 2010-03-10 | 2011-09-15 | 富士フイルム株式会社 | 回収印刷版の溶解方法及びリサイクル方法 |
| JP2015034665A (ja) * | 2013-08-08 | 2015-02-19 | 株式会社メイチュー | 金属溶解炉 |
| JP2018534516A (ja) * | 2015-10-13 | 2018-11-22 | 健 梶谷 | 溶解炉 |
| WO2020235579A1 (ja) * | 2019-05-23 | 2020-11-26 | 日本坩堝株式会社 | 溶解炉 |
-
2023
- 2023-11-22 JP JP2024560197A patent/JPWO2024111648A1/ja active Pending
- 2023-11-22 WO PCT/JP2023/042061 patent/WO2024111648A1/ja not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11264029A (ja) * | 1998-03-17 | 1999-09-28 | Nippon Light Metal Co Ltd | アルミニウム精製方法及び精製装置 |
| WO2011111525A1 (ja) * | 2010-03-10 | 2011-09-15 | 富士フイルム株式会社 | 回収印刷版の溶解方法及びリサイクル方法 |
| JP2015034665A (ja) * | 2013-08-08 | 2015-02-19 | 株式会社メイチュー | 金属溶解炉 |
| JP2018534516A (ja) * | 2015-10-13 | 2018-11-22 | 健 梶谷 | 溶解炉 |
| WO2020235579A1 (ja) * | 2019-05-23 | 2020-11-26 | 日本坩堝株式会社 | 溶解炉 |
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| JPWO2024111648A1 (ja) | 2024-05-30 |
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